Article
Chemistry, Physical
Renwei Li, Qicheng Chen, Zilong Zhang, Liang Ouyang, Yingjin Zhang, Binjian Nie, Yulong Ding
Summary: Based on density functional theory, the adhesion work, tensile failure, and electronic properties of gamma-Fe/alpha-Al2O3 interfaces with Al- and O-terminations were systematically investigated. The results showed that the O-terminated interface exhibited stronger bonding strength and tensile performance compared to the Al-terminated interface, with different failure positions.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Article
Engineering, Biomedical
Huan Liang, Jingru Guo, Yiyue Shi, Guizhen Zhao, Shouheng Sun, Xiaolian Sun
Summary: A new porous yolk shell nanostructure, PYSNPs, has been reported to stabilize Fe(0) in normal physiological conditions and control its release in the tumor microenvironment for enhanced cancer therapy. These PYSNPs exhibit superior tumor inhibition and can effectively suppress tumor growth in vivo with minimal side effects. Additionally, the disintegration of PYSNPs in the acidic tumor microenvironment can lead to significant changes in MRI signals for contrast-enhanced diagnosis.
Article
Chemistry, Physical
Rongwei Zheng, Ruifan Tan, Yali Lv, Xiaoling Mou, Junqiao Qian, Ronghe Lin, Ping Fang, Weidong Kan
Summary: Iron-based materials are commonly used in Fenton chemistry for wastewater treatment. However, the complexity of their composition and rich chemistry of iron and/or oxides make it difficult to understand the active sites and working mechanism. In this study, iron oxide model systems were designed using a conventional precipitation method and H-2 reduction treatment, including Fe@Fe3O4, Fe-0, and Fe3O4 nanoparticles of different sizes. These materials were tested for their Fenton activity in the decomposition of methyl orange. The Fe@Fe3O4 core-shell structures exhibited higher activity compared to other Fe3O4-rich nanoparticles, possibly due to the presence of both metallic iron and oxygen vacancy.
Article
Materials Science, Multidisciplinary
Zeeshan Ali, Zhen Wang, Andrew O'Hara, Mohammad Saghayezhian, Donghan Shin, Yimei Zhu, Sokrates T. Pantelides, Jiandi Zhang
Summary: This study combines experimental and theoretical investigations to explore the electromagnetic properties of ultrathin epitaxial ruthenate films. The results show that the n = 2 heterostructure is metallic and ferromagnetic, while the n = 1 heterostructure leads to a loss of metallicity and ferromagnetism.
Article
Chemistry, Physical
Renwei Li, Qicheng Chen, Liang Ouyang, Yulong Ding
Summary: This study investigated the ideal work of adhesion, interfacial energy, charge density, charge density difference and partial density of states at the γ-Fe (111)/α-Al2O3 (0001) interface using first-principles calculations. Three different interface types were identified, with the O-terminated interface exhibiting the highest bonding strength. The electron concentration order was found to be O->Al2->Al1-terminated, reflecting differences in interactions at the interface.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Article
Chemistry, Physical
Gao Wang, Chunrong Li, Jindi Feng, Zhenhua Zhang, Xiaojuan Yuan, Yong Liu, Shupeng Song, Jing Liu, Dengjing Wang, Zhihong Lu, Rui Xiong
Summary: The study shows that the partial substitution of Mn or Fe for Co atoms can suppress the formation of Co-Cr antisite defect, leading to better tolerance for atomic disorder in CoMnCrAl or CoFeCrAl. Additionally, CoMnCrAl exhibits a negative temperature coefficient of resistance in the range of 10-273 K. These quaternary alloys have low magnetization, decently high Curie temperature, and robust half metallicity, making them promising for spintronic applications.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Materials Science, Multidisciplinary
M. Naveed-Ul-Haq, Gul-e-Ali
Summary: This study investigates the elastic, electronic, and magnetic properties of orthorhombic niobates containing magnetic transition ions (Mn, Fe, Co, and Ni). The results show that these compounds have promising potential for applications in energy storage, electro-photoactivity, and low-dimensional magnetic character. The study provides a comprehensive theoretical investigation of the materials properties, enabling researchers to tailor their properties according to specific application requirements.
MATERIALS TODAY COMMUNICATIONS
(2023)
Article
Engineering, Electrical & Electronic
Rui Wu, Di Zhang, Tuhin Maity, Ping Lu, Jie Yang, Xingyao Gao, Shishun Zhao, Xiucheng Wei, Hao Zeng, Ahmed Kursumovic, Guang Tian, Weiwei Li, Chao Yun, Yongqiang Wang, Zengyao Ren, Ziyao Zhou, Ming Liu, Kelvin H. L. Zhang, Quanxi Jia, Jinbo Yang, Haiyan Wang, Judith L. MacManus-Driscoll
Summary: Adding antiferromagnet to a 3-1-type multiferroic nanocomposite can result in a large, self-biased magnetoelectric effect at room temperature.
NATURE ELECTRONICS
(2021)
Article
Materials Science, Ceramics
B. V. Neamtu, M. Pszola, H. Vermesan, G. Stoian, M. Grigoras, A. Oprisa, L. Cotojman, T. F. Marinca, N. Lupu, I. Chicinas
Summary: The method of preparing soft magnetic composites using Fe3O4 coated Fe fibers and the performance characteristics were studied. The experiment showed that increasing the coating thickness may slightly reduce magnetic properties, but can inhibit the development of eddy currents on a larger scale.
CERAMICS INTERNATIONAL
(2021)
Article
Materials Science, Ceramics
Renwei Li, Qicheng Chen, Liang Ouyang, Yingjin Zhang, Binjian Nie, Yulong Ding
Summary: Corrosion prevention is a crucial concern in thermal energy storage, particularly in high-temperature environments. Studying the doped alloy elements revealed that Ti and Mg significantly enhance interfacial bonding strength, while Cr and Ni are ineffective in this aspect. The presence of Mg and Ti atoms at the interface shows an enhancement effect as interfacial binders.
CERAMICS INTERNATIONAL
(2021)
Article
Engineering, Environmental
Yao Zhang, Haoran Guo, Xinpan Li, Jing Du, Wenlu Ren, Rui Song
Summary: The rational interface design of noble-metal-free electrocatalysts is crucial for improving efficiency and durability in overall water splitting. In this study, the Fe-Mo-S/Ni3S2@NF with a coral-like microstructure and multiple interfaces demonstrates high activity for HER and OER, achieving a low cell voltage in alkaline solution. The favorable contributions of multi-interfaces towards electrocatalytic reactions are further investigated, providing insights for future electrolysis catalyst design.
CHEMICAL ENGINEERING JOURNAL
(2021)
Article
Chemistry, Physical
Yang He, Yunjuan Su, Haobo Yu, Changfeng Chen
Summary: This study investigated the trapping sites and diffusion behaviors of hydrogen atoms in different iron grain boundary structures through first-principles calculations. The diffusion behavior of hydrogen in grain boundaries was found to have an impact on hydrogen embrittlement phenomenon.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2021)
Article
Chemistry, Multidisciplinary
Xiangyun Xiao, Seok-Ho Lee, Geun-Ho Han, Kyong Ryol Tag, Jae Pyoung Ahn, Hong-Kyu Kim, Kwan-young Lee, Taekyung Yu
Summary: Structure engineering is an integrated strategy to enhance the performance of nanoparticles. In this study, clear core-shell structured Pd@Fe nanocubes with different shell thicknesses were synthesized, which showed higher H-2 conversion efficiency in direct hydrogen peroxide generation compared to ordinary Pd cubes. The advantages of the core-shell structure were attributed to the conformal growth of the Fe oxide shell and the removal of the capping agent on the Pd-Fe3O4 interface, leading to improved H-2 penetration and increased number of active sites on the inner core surface.
JOURNAL OF INDUSTRIAL AND ENGINEERING CHEMISTRY
(2023)
Article
Chemistry, Multidisciplinary
Shahid Mehmood, Zahid Ali, Norah Alwadai, Maryam Al Huwayz, M. S. Al-Buriahi, S. V. Trukhanov, D. I. Tishkevich, A. V. Trukhanov
Summary: DFT was used in this study to investigate the electronic band profiles of CaCu3B2Re2O12 (B = Mn, Fe, Co, and Ni), and it was found that these compounds exhibit half-metallic character. The magnetic energy curves showed type-I ferrimagnetic order in all the compounds. The Cu-B, B-Re, and Cu-Re site spins interact through the Heisenberg model, resulting in the Cu(up arrow)B(up arrow)Re(down arrow) order. The Re moments anti-align with B and Cu, leading to ferrimagnetism.
JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS
(2023)
Article
Materials Science, Multidisciplinary
P. Taivansaikhan, D. Odkhuu
Summary: In this study, density functional theory and density functional perturbation theory were used to investigate the magnetic structure and magnetocrystalline anisotropy (MCA) of MnPt3(001) thin films. The results suggest that the surface termination of the thin films significantly affects their magnetic properties, with Pt termination exhibiting extremely large perpendicular MCA.
Article
Physics, Applied
Tomohiro Nozaki, Satya Prakash Pati, Yohei Shiokawa, Motohiro Suzuki, Toshiaki Ina, Ko Mibu, Muftah Al-Mahdawi, Shujun Ye, Masashi Sahashi
JOURNAL OF APPLIED PHYSICS
(2019)
Article
Chemistry, Multidisciplinary
Keisuke Shimizu, Ryo Kawabe, Hajime Hojo, Haruki Shimizu, Hajime Yamamoto, Marin Katsumata, Kei Shigematsu, Ko Mibu, Yu Kumagai, Fumiyasu Oba, Masaki Azuma
Article
Materials Science, Multidisciplinary
Katsuyoshi Naruse, Masaaki Tanaka, Kosuke Nomura, Takuya Taniguchi, Syuta Honda, Teruo Ono, Ko Mibu
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
(2019)
Article
Physics, Multidisciplinary
Takaya Mitsui, Ko Mibu, Masaaki Tanaka, Shinji Kitao, Yasuhiro Kobayashi, Ryo Masuda, Makoto Seto
JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN
(2020)
Article
Physics, Applied
Kei Shigematsu, Haruki Shimizu, Marin Katsumata, Keisuke Shimizu, Hajime Yamamoto, Ko Mibu, Masaki Azuma
APPLIED PHYSICS EXPRESS
(2020)
Article
Chemistry, Inorganic & Nuclear
Hiroaki Hagiwara, Ryo Minoura, Taro Udagawa, Ko Mibu, Jun Okabayashi
INORGANIC CHEMISTRY
(2020)
Article
Physics, Applied
Masaaki Tanaka, Musashi Shimazaki, Tatsuro Ohmasa, Takafumi Suzuki, Shunsuke Honda, Syuta Honda, Hiroyuki Awano, Ko Mibu
JOURNAL OF APPLIED PHYSICS
(2020)
Article
Multidisciplinary Sciences
Xubin Ye, Jianfa Zhao, Hena Das, Denis Sheptyakov, Junye Yang, Yuki Sakai, Hajime Hojo, Zhehong Liu, Long Zhou, Lipeng Cao, Takumi Nishikubo, Shogo Wakazaki, Cheng Dong, Xiao Wang, Zhiwei Hu, Hong-Ji Lin, Chien-Te Chen, Christoph Sahle, Anna Efiminko, Huibo Cao, Stuart Calder, Ko Mibu, Michel Kenzelmann, Liu Hao Tjeng, Runze Yu, Masaki Azuma, Changqing Jin, Youwen Long
Summary: The crystal structure of PbFeO3 is an unusual orthorhombic perovskite super unit cell with distinctive charge ordering. The presence of two different oxidation states of Pb and Fe leads to long range charge ordering in the -A-B-B- layers. The material exhibits weak ferromagnetic transition at 600K and spin reorientation towards a collinear antiferromagnetic structure at a lower temperature.
NATURE COMMUNICATIONS
(2021)
Article
Green & Sustainable Science & Technology
Mattia De Colle, Sohei Sukenaga, Ko Mibu, Yusuke Kato, Hisahiro Matsunaga, Par G. Jonsson, Andrey Karasev, Hiroyuki Shibata
Summary: Steel slags swell in water or humidity due to the presence of MgO and CaO, hindering their proper recycling. This study examines the hydration rate of the FeO-MgO RO phase and finds a linear correlation between initial FeO content and weight loss.
JOURNAL OF SUSTAINABLE METALLURGY
(2021)
Article
Chemistry, Inorganic & Nuclear
Makoto Minohara, Yuka Dobashi, Naoto Kikuchi, Akane Samizo, Kouhei Tsukuda, Keishi Nishio, Ko Mibu, Hiroshi Kumigashira, Izumi Hase, Yoshiyuki Yoshida, Yoshihiro Aiura
Summary: Oxide semiconductors usually lack bipolar conductivity, but bipolar semiconducting properties are demonstrated in α-SnWO4 after appropriate thermal treatment. The presence of Sn-4(+) substitutional defects on W-6(+) sites contributes to hole-carrier generation, and oxygen vacancies play a role in the transition of semiconducting properties from p-type to n-type.
INORGANIC CHEMISTRY
(2021)
Article
Chemistry, Physical
Akane Samizo, Makoto Minohara, Naoto Kikuchi, Kyoko K. Bando, Yoshihiro Aiura, Ko Mibu, Keishi Nishio
Summary: The study revealed a correlation between the amount of oxygen vacancy (V-O(center dot center dot)) and crystal structure in Sn-Nb complex oxides, indicating a higher concentration of V-O(center dot center dot) in p-type Sn2Nb2O7 compared to p-type SnNb2O6, affecting hole-generation efficiency. Evaluation of Sn-O bond strength suggested a dependence of V-O(center dot center dot) formation on crystal structure, emphasizing the importance of designing materials with a focus on the local structure around Sn ions to prevent the formation of V-O(center dot center dot) in p-type Sn2+ oxides.
JOURNAL OF PHYSICAL CHEMISTRY C
(2021)
Article
Chemistry, Inorganic & Nuclear
Teppei Nagase, Takumi Nishikubo, Masayuki Fukuda, Yuki Sakai, Kei Shigematsu, Yoichi Ikeda, Yusuke Nambu, Qiang Zhang, Masaaki Matsuda, Ko Mibu, Masaki Azuma, Takafumi Yamamoto
Summary: We report room-temperature magnetoresistance in a novel Fe-based perovskite compound, which exhibits weak ferromagnetism and a large negative MR. The compound has a layered structure with ordered oxygen vacancies and transition metal ions, forming a magnetically striped lattice. Despite the small saturation moment, this type of compound shows promising potential for large MR through chemical substitution.
INORGANIC CHEMISTRY
(2022)
Article
Chemistry, Inorganic & Nuclear
Shiori Kihara, Yuki Sakai, Shogo Wakazaki, Takumi Nishikubo, Takehiro Koike, Ko Mibu, Hongwu Yu, Yoichi Okimoto, Shin-ya Koshihara, Masaki Azuma
Summary: Bi0.5Pb0.5FeO3 with a 1:1 mixture of Bi and Pb was successfully synthesized for the first time by high-pressure synthesis, revealing a unique crystal structure and ion distribution. The valence of metal M changes as the 3d-level becomes deeper, while Bi and Pb increase their valence to compensate for the decrease in M's valence.
INORGANIC CHEMISTRY
(2022)
Article
Physics, Applied
Masaaki Tanaka, Motoharu Furuta, Tomoyuki Ichikawa, Masaya Morishita, Yu-Min Hung, Syuta Honda, Teruo Ono, Ko Mibu
Summary: This study demonstrated the generation of perpendicularly spin-polarized electronic currents using a tunnel spin-filtering effect through insulative Fe-rich cobalt ferrite CoxFe3-xO4+delta (I-CFO) barriers with perpendicular magnetic anisotropy (PMA). The combination of well-controlled compositions and lattice strains in spinel-type C-CFO and I-CFO films is applicable as a spin-injection source for spintronics devices when perpendicularly spin-polarized electronic currents are required.
APPLIED PHYSICS LETTERS
(2023)
Article
Materials Science, Multidisciplinary
Jun Okabayashi, Masaaki A. Tanaka, Masaya Morishita, Hideto Yanagihara, Ko Mibu
Summary: This study investigates the element-specific spin and orbital states in Co-ferrite thin films and explores their roles in magnetic anisotropy. The results show that the large perpendicular orbital magnetic moments in Co2+ states are the main reason for the observed perpendicular magnetic anisotropy in the low-x region. In addition, the enhancement of orbital magnetic moments along the out-of-plane direction through tensile strain can add material functionalities in spinel ferrite thin films.
